US Patent 11525947 Fresnel lens and display devices with such Fresnel lens

Provided is a Fresnel lens and display device with such Fresnel lens, the Fresnel lens includes an entrance plane and an exit plane with multiple bump units. The bump units include a First Bump Unit, a Second Bump Unit, and a Third Bump Unit; on one side of the central axis of said lens, the First Bump Unit, Second Bump Unit and Third Bump Unit are placed successively along the radiation direction from the central axis toward the lens edge; on the other side of the central axis of said lens, the First Bump Unit, Second Bump Unit and Third Bump Unit are also placed successively along the radiation direction from the central axis toward the lens edge. The Bump Units on both sides of the central axis of the lens are symmetrical.